Abstract
In the first part of this chapter we will introduce a general temporally enhanced conceptual data model able to represent time varying data in the spirit of a temporally enhanced entity-relationship data model. In the second part, we will introduce an object-oriented conceptual data model enriched with schema change operators, which can represent the explicit temporal evolution of the schema while maintaining a consistent view of (static) instantiated data. We will introduce a provably correct encoding of both conceptual data models and their inference problems in description logics. In this way, we study the properties of both the temporal conceptual data model and the object-oriented data model with schema change facilities.
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